Audited 05 Aug 2026·Last updated 08 Aug 2026·5 citations·Tier 1·0 uses

2026 Solo 401k Contribution Calculator

2026 Solo 401k Contribution Calculator: combine owner employee deferral and employer contribution without putting catch-up inside the annual-additions cap.

2026 Solo 401k Contribution Calculator

%
Total employee, employer and catch-up contribution
48,500.00
Total employee, employer and catch-up contribution under the page's named retirement convention.
Employer contribution before annual cap
24,000.00
Contribution subject to annual-additions limit
48,500.00
Governing figure year
2,026

Background.

A reader arrives at 2026 Solo 401k Contribution Calculator to combine owner employee deferral and employer contribution without putting catch-up inside the annual-additions cap. A one-participant 401(k) treats the owner in two capacities, but elective deferrals are shared across the person's plans. For that reason, this page names its convention as “annual additions = min(employee deferral + eligible compensation × employer rate, annual-additions limit); applicable catch-up is added outside that limit.”

The editable entries are eligible compensation after plan adjustments, employee elective deferral, applicable employer contribution rate, 2026 annual-additions limit, applicable age-based catch-up. Use values from the document or measurement that governs this 2026 solo 401k contribution question; the defaults are only the worked fixture below. Before relying on the number, check this 2026 solo 401k contribution boundary: self-employed compensation requires the Publication 560 iterative adjustment; this simplified employer percentage assumes eligible compensation is already known.

IRS One-Participant 401(k) Plans; separate employee and employer contribution capacities documents the convention or governing rule used here. The 2026 solo 401k contribution output is a transparent scenario under those facts: it does not manufacture an unentered market price, professional determination, carrier quote, legal eligibility finding or locally adopted code value.

What is 2026 solo 401k contribution calculator?

2026 Solo 401k Contribution is the relationship behind this decision: a one-participant 401(k) treats the owner in two capacities, but elective deferrals are shared across the person's plans. On this page it means annual additions = min(employee deferral + eligible compensation × employer rate, annual-additions limit); applicable catch-up is added outside that limit. Self-employed compensation requires the Publication 560 iterative adjustment; this simplified employer percentage assumes eligible compensation is already known; that is the line between the reported quantity and a broader retirement analysis.

How to use this calculator.

  1. Confirm that “annual additions = min(employee deferral + eligible compensation × employer rate, annual-additions limit); applicable catch-up is added outside that limit” matches the 2026 solo 401k contribution convention you need.
  2. Replace the fixture values for eligible compensation after plan adjustments, employee elective deferral, applicable employer contribution rate, 2026 annual-additions limit, applicable age-based catch-up with dated values from the governing record.
  3. Keep all currencies, measurement units and time periods on the same basis before calculating.
  4. Read total employee, employer and catch-up contribution together with this boundary: Self-employed compensation requires the Publication 560 iterative adjustment; this simplified employer percentage assumes eligible compensation is already known.

The formula.

annual additions = min(employee deferral + eligible compensation × employer rate, annual-additions limit); applicable catch-up is added outside that limit
eligibleCompensation · Eligible compensation after plan adjustmentsemployeeDeferral · Employee elective deferralemployerRatePercent · Applicable employer contribution rateannualAdditionsLimit · 2026 annual-additions limitcatchUpContribution · Applicable age-based catch-up

The calculation uses annual additions = min(employee deferral + eligible compensation × employer rate, annual-additions limit); applicable catch-up is added outside that limit. In this 2026 solo 401k contribution model, the entered terms are eligible compensation after plan adjustments, employee elective deferral, applicable employer contribution rate, 2026 annual-additions limit, applicable age-based catch-up. A one-participant 401(k) treats the owner in two capacities, but elective deferrals are shared across the person's plans, which is why the relationship is presented under this name rather than as a universal alternative. Self-employed compensation requires the Publication 560 iterative adjustment; this simplified employer percentage assumes eligible compensation is already known. Calculations keep full decimal precision through the relationship and round only the returned display values.

A worked example.

Example

Using Eligible compensation after plan adjustments = 120,000; Employee elective deferral = 24,500; Applicable employer contribution rate = 20; 2026 annual-additions limit = 72,000; Applicable age-based catch-up = 0, the page applies annual additions = min(employee deferral + eligible compensation × employer rate, annual-additions limit); applicable catch-up is added outside that limit. The hand-check totals are Total employee, employer and catch-up contribution = 48,500; Employer contribution before annual cap = 24,000; Contribution subject to annual-additions limit = 48,500; Governing figure year = 2,026; in particular, total employee, employer and catch-up contribution is 48,500. No rate or quantity beyond the listed fixture is inserted. A one-participant 401(k) treats the owner in two capacities, but elective deferrals are shared across the person's plans. Self-employed compensation requires the Publication 560 iterative adjustment; this simplified employer percentage assumes eligible compensation is already known.

employee Deferral24,500
catch Up Contribution0
annual Additions Limit72,000
eligible Compensation120,000
employer Rate Percent20

Frequently asked questions.

What exactly does the total employee, employer and catch-up contribution represent?
For 2026 Solo 401k Contribution, it represents the result of annual additions = min(employee deferral + eligible compensation × employer rate, annual-additions limit); applicable catch-up is added outside that limit under the entered facts. A one-participant 401(k) treats the owner in two capacities, but elective deferrals are shared across the person's plans; the 48,500 fixture should be read on that basis.
Which 2026 solo 401k contribution convention does this page choose?
It chooses “annual additions = min(employee deferral + eligible compensation × employer rate, annual-additions limit); applicable catch-up is added outside that limit.” That 2026 solo 401k contribution variant is supported by IRS One-Participant 401(k) Plans; separate employee and employer contribution capacities; a governing contract, policy, tax year or locally adopted rule that specifies another treatment must take priority.
What is the easiest way to get this 2026 solo 401k contribution result wrong?
Self-employed compensation requires the Publication 560 iterative adjustment; this simplified employer percentage assumes eligible compensation is already known. Check that 2026 solo 401k contribution issue before interpreting the output or comparing it with another model.
Can the worked 2026 solo 401k contribution example be checked without this site?
Yes. Use Eligible compensation after plan adjustments = 120,000; Employee elective deferral = 24,500; Applicable employer contribution rate = 20; 2026 annual-additions limit = 72,000; Applicable age-based catch-up = 0, follow annual additions = min(employee deferral + eligible compensation × employer rate, annual-additions limit); applicable catch-up is added outside that limit, and compare your final figures with Total employee, employer and catch-up contribution = 48,500; Employer contribution before annual cap = 24,000; Contribution subject to annual-additions limit = 48,500; Governing figure year = 2,026. Keep the 2026 solo 401k contribution intermediates unrounded so formatting does not create a false difference.

References& sources.

  1. [1]IRS One-Participant 401(k) Plans; separate employee and employer contribution capacities. Retrieved 2026-08-07. access: open unless marked otherwise.
  2. [2]IRS Retirement Topics, 401(k) and profit-sharing contribution limits, updated for 2026. Retrieved 2026-08-07. access: open unless marked otherwise.
  3. [3]U.S. Internal Revenue Service. Publication 560, Retirement Plans for Small Business. Retrieved 2026-08-07. independence: primary; access: open.
  4. [4]U.S. Internal Revenue Service. 401(k) limit increases to $24,500 for 2026; IRA limit increases to $7,500. Retrieved 2026-08-07. independence: primary; access: open.
  5. [5]U.S. Internal Revenue Service. Retirement topics — catch-up contributions. Retrieved 2026-08-07. independence: primary; access: open.

How this page was produced

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Method
annual additions = min(employee deferral + eligible compensation × employer rate, annual-additions limit); applicable catch-up is added outside that limit
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